Add comprehensive test coverage for Operators View page

[Copilot]

Operators View page had minimal test coverage (3 tests). Added 8 tests following patterns from EstateIndexPageTests to cover button navigation, field display states, and error handling.

New Test Coverage

Navigation

• Back to List button click → /operators navigation
• Back to List button from "not found" state → /operators navigation

Field Display States

• RequireCustomMerchantNumber: Required/Not Required badge rendering
• RequireCustomTerminalNumber: Required/Not Required badge rendering

Error Handling

• LoadOperator failure → error page navigation
• Null operator model → "Operator not found" display

Pattern Matching

Uses same approach as EstateIndexPageTests:

// Button finding
IRefreshableElementCollection<IElement> buttons = cut.FindAll("button");
IElement? backButton = buttons.FirstOrDefault(b => b.TextContent.Contains("Back to List"));
backButton?.Click();

// Navigation verification
_fakeNavigationManager.Uri.ShouldContain("/operators");

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• f.feedz.io
  • Triggering command: /usr/bin/dotnet dotnet test EstateManagementUI.BlazorServer.Tests/EstateManagementUI.BlazorServer.Tests.csproj --filter FullyQualifiedName~OperatorsViewPageTests --logger console;verbosity=detailed (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

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This section details on the original issue you should resolve

<issue_title>Improve Code Coverage on Operators View Page</issue_title>
<issue_description>Use the estate index page tests as a guide on how to find buttons and also verify navigation</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Improve Code Coverage on Operators View Page #728

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